The left believes Trump is abusing his power to punish and undermine his critics, and may be jeopardizing national security interests in the long run.

The right, while critical of Brennan, is divided about the revocation.

“Trump’s extraordinary decision to revoke Brennan’s security clearance — and possibly do the same for other top officials who are openly critical of the administration — probably won’t do much practically. But it sets a chilling precedent for both free speech and the peaceful transition of power between administrations.”

Some worry that Trump may strip clearances from even more former officials. “Those mentioned during the White House press briefing who are under consideration to have their clearances revoked have been on the front lines of the global cyber war... We cannot afford to lose their institutional knowledge during this critical time... This is the time to lock arms against the enemy, not to voluntarily disarm by taking our best, brightest and most experienced defenders off the battlefield.”

CNN

The right, while critical of Brennan, is divided about the revocation.

Many argue that “we certainly shouldn’t want to see former officials lose their security clearances just because they criticize the president robustly... John Brennan, though, presents a different case. ‘Erratic’ properly describes his shrill and often mindless attacks on Trump. Moreover, his hatred of the president is so palpable that one can easily imagine him using access to secret information to harm the administration.”